1. Which of the following is NOT evidence that an asteroid impact...

1. Which of the following is NOT evidence that an asteroid impact was responsible for the K-T mass extinction event 65 million years ago?

Group of answer choices

Iridium-rich clay between Cretaceous Paleogene strata worldwide.

 

A large impact crater off Mexico's Yucatan peninsula.

 

Impact ejecta found in ocean floor core samples near Florida.

 

An episode of massive volcanism in the Siberian Traps.

 

2. How many mass extinction events, those causing at least 25% of all animal families to go extinct, have occurred during the Phanerozoic Eon?

Group of answer choices

There have been no major extinction events during the Phanerozoic.

 

There have been five (5) major exinction events during the Phanerozoic.

 

Just one: the K-T event 65 million years ago.

 

There have been 20 major exinction events during the Phanerozoic.

 

3. The first primates appeared on the Earth about

Group of answer choices

360 Million years ago

 

540 Million years ago

 

60 Million years ago

 

220 Million years ago

 

4. The Cambrian Explosion was marked by

Group of answer choices

the mass extinction of dinosaurs

 

the end of the Epoch of Heavy Bombardment.

 

the emergence of the first eukaryotes.

 

the emergence of diverse forms of complex life